Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 536
ation there is no movement or vibration feltby the teeth ; in Hstening to a piano there is a very faintsensation as if the Audiphone vibrated slightly, while withthe handle of the Audiphone resting on the sounding-boardof the piano the vibrations are so violent as to be painfulto the teeth. By… … The Telephone, enables them to hear their own voices, and thus to trainthem to express words, while, before, they could onlymake inarticulate sounds. We have a variation of this instrument which has beenintroduced employing a diaphragm held in a telephonemouthpiece, and free to vibrate under the…
Scientific recreations
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